//众所周知php原生函数substr是不支持截取中文字符串的。下面的代码提供了多种截取php中文字符串的方法。//1. 截取GB2312中文字符串
     0xa0) {            $tmpstr .= substr($str, $i, 2);            $i++;        } else            $tmpstr .= substr($str, $i, 1);    }    return $tmpstr;}?>//2. 截取utf8编码的多字节字符串
    //3. UTF-8、GB2312都支持的汉字截取函数
     $sublen) return join('', array_slice($t_string[0], $start, $sublen))."...";        return join('', array_slice($t_string[0], $start, $sublen));    }    else    {        $start = $start*2;        $sublen = $sublen*2;        $strlen = strlen($string);        $tmpstr = '';        for($i=0; $i< $strlen; $i++)        {            if($i>=$start && $i< ($start+$sublen))            {                if(ord(substr($string, $i, 1))>129)                {                    $tmpstr.= substr($string, $i, 2);                }                else                {                    $tmpstr.= substr($string, $i, 1);                }            }            if(ord(substr($string, $i, 1))>129) $i++;        }        if(strlen($tmpstr)< $strlen ) $tmpstr.= "...";        return $tmpstr;    }}$str = "abcd需要截取的字符串";echo cut_str($str, 8, 0, 'gb2312');?>//4. BugFree 的字符截取函数< ?php/** * @package     BugFree * @version     $Id: FunctionsMain.inc.php,v 1.32 2005/09/24 11:38:37 wwccss Exp $ * * * Return part of a string(Enhance the function substr()) * * @author                  Chunsheng Wang 
    
      * @param string  $String  the string to cut. * @param int     $Length  the length of returned string. * @param booble  $Append  whether append "...": false|true * @return string           the cutted string. */function sysSubStr($String,$Length,$Append = false){    if (strlen($String) < = $Length )    {        return $String;    }    else    {        $I = 0;        while ($I < $Length)        {            $StringTMP = substr($String,$I,1);            if ( ord($StringTMP) >=224 )            {                $StringTMP = substr($String,$I,3);                $I = $I + 3;            }            elseif( ord($StringTMP) >=192 )            {                $StringTMP = substr($String,$I,2);                $I = $I + 2;            }            else            {                $I = $I + 1;            }            $StringLast[] = $StringTMP;        }        $StringLast = implode("",$StringLast);        if($Append)        {            $StringLast .= "...";        }        return $StringLast;    }}$String = "17test.info 走在中国自动化测试的前沿";$Length = "18";$Append = false;echo sysSubStr($String,$Length,$Append);?>